Discover the top SEO agencies in United Kingdom. Compare services, reviews, and find the perfect agency for your business.
London, United Kingdom
one2one Digital is a results-driven digital marketing agency based in London, specializing in tailored online marketing solutions. Our team combines…
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London, United Kingdom
Based in London, One9Seven6 is a small digital marketing and content agency working with brands across sectors including luxury goods, financial serv…
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Romford, United Kingdom
Based in Romford, London, OneClickDigitalPlatform is a small digital marketing agency, with a team of up to ten people, working with businesses seeki…
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Worksop, United Kingdom
Based in Worksop, Oneiro Digital is a boutique ecommerce and performance marketing agency operating in the UK, working with a small team of one to te…
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London, United Kingdom
Onelink is based in London and works with scale-up and PE-backed businesses, typically brands with £10m+ ARR or investor backing where marketing func…
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Great Warley, United Kingdom
Based in Great Warley and serving businesses across London, Essex and beyond, Online Business Solutions is a small performance marketing agency worki…
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Manchester, United Kingdom
Based in Manchester, England, this small agency (team of 1-10, founded in 2017) has developed a specialism in the online gardening sector alongside i…
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Hullbridge, United Kingdom
Based in Hullbridge, Essex, Online Marketing Help works with small businesses across the UK looking for support across website development and digita…
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Norton Canes, United Kingdom
Based in Norton Canes, England, Online Marketing Surgery is a small digital marketing agency working with a team of up to ten people. Its client base…
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UK, United Kingdom
Online Team is a UK-based digital marketing agency specialized in delivering comprehensive online solutions that empower businesses to thrive in the…
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Watford, United Kingdom
Based in Watford, England, Only Media works with businesses seeking custom website builds and ongoing digital marketing support, with a particular fo…
View ProfileUnited Kingdom
Onside Creative is a UK-based agency specializing in creative solutions for businesses. They focus on delivering tailored services that enhance brand…
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Leeds, United Kingdom
Based in Leeds, Onstate Limited is a Shopify Plus agency working with retail and eCommerce brands across sectors including fashion, homeware, and con…
View ProfileNewtown, United Kingdom
Ontrac is a creative marketing agency based in Newtown, Mid Wales, specializing in design, print, websites, and point of sale. With over 25 years of…
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Milton Keynes, United Kingdom
Oomph Creative is a vibrant agency specializing in videography and photography. They focus on helping organizations engage effectively with their aud…
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Birmingham, United Kingdom
Founded in 2008 and based in Birmingham, Opace is a family-run digital agency working with businesses across the West Midlands, the UK and internatio…
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Oxford, United Kingdom
Based in Oxford, this agency builds websites on the Drupal platform for retailers, drinks trade specialists, and other growth-focused businesses acro…
View ProfileCheltenham, United Kingdom
Opiyo Digital is a data-driven digital marketing agency based in Cheltenham. Since 2010, they have been delivering outstanding results through the cr…
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London, United Kingdom
Operating from offices in London and Istanbul, Optdcom is a digital marketing agency built around data and technology, working with brands that need…
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United Kingdom
Based in London, this small team specialises in Shopify and Shopify Plus, working with ecommerce businesses in sectors such as fashion, food, apparel…
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The complete migration playbook: what to freeze before launch, how to build a redirect map that actually holds, what to test on the staging site, and how to read the first eight weeks after go-live.
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How B2B search really works: bottom-of-funnel pages before blog volume, comparison and alternatives content, product-led assets, and attribution that survives a six-month cycle.
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This directory lists 3,907 agencies in United Kingdom, spread across 918 cities. 3,443 of them publish a direct contact (email or phone). The best-represented cities are London (722), UK (191), Manchester (123).
| Team size | United Kingdom | What it means |
|---|---|---|
| 1-10 | 2,948 (75%) | One contact, often the founder. Responsive, limited capacity. |
| 11-50 | 429 (11%) | Specialists per discipline. The most common trade-off. |
| 51-200 | 10 (0%) | Several teams, formal process, higher budgets. |
| 200+ | 22 (1%) | International structure, enterprise accounts. |
Across the 3,907 agencies in this country: SEO (94%), Web Design (65%), SEA/PPC (50%), Social Media (47%), Content Marketing (44%), Web Development (38%). SEO leads with 3,655 agencies.
Stated engagement floors in United Kingdom range from $1,000+ to $100,000+. The most common is $1,000+ (953 agencies). That figure is an entry floor, not a price: it says what size of engagement the agency will take on, which stays the fastest filter for ruling out the ones that do not match your scale.
The 3,907 agencies on this page are ordered by how complete their listing is, not by payment: nobody buys a position here. The information comes from each agency's own website, checked as live. An agency can claim its listing to correct or complete it.
Should you pick an agency based in United Kingdom? Proximity matters most for local SEO and the language your content is written in. Here, English and Spanish are the most declared working languages. For an international site, where the agency sits matters less than its experience in your market.
Small or large agency? 75% of agencies here have fewer than ten people, against 32 above fifty. A small team means direct access to the people doing the work; a large one absorbs heavier programmes without depending on one person.
What to check before signing? Ask for measured results on a site comparable to yours, who actually does the work, and what happens when the contract ends: deliverables and access must stay yours. An agency that will not show its method is selling a black box.
